Patent attributes
A printer having a thermal head disposed such that when heater elements are in contact with a platen, the following formulas are satisfied: H1≦H≦Hmax; Hmax=(H1+H2)=L tan(θ1+θ3); and θ′=(θ2−θ1)=(3°±1°). Length L is between a first line perpendicular to a top-substrate-surface and extending through a contact point between the heater elements and the platen, and a second line perpendicular to the top-substrate-surface and extending through a peak of a sealing member; height H is from the top-substrate-surface to the peak; height H1 is from the top-substrate-surface to a tangent between the platen and the heater elements; height H2 is from the tangent to a conveying path of a recording medium; angle θ1 is between the tangent and the top-substrate-surface; θ2 denotes a slope angle of a projection from the tangent; angle θ3 is between the tangent and the conveying path; and θ′ denotes a head-returning angle.
